How long do car air fresheners actually last?

Manufacturer claims of 30, 60, or even 180 days are routinely contested by verified-purchase reviewers and specialist subreddits. In practice, vent-clip fresheners on the lowest setting tend to deliver noticeable scent for two to four weeks, hanging cardboard trees fade meaningfully after one to three weeks, and wood/stone diffusers often weaken within a month despite premium positioning. Heat, sunlight, and how often you run the HVAC all shorten lifespan.